Unfortunately, the Libre Readers are still "Temporarily Unavailable" according to the Abbott site.If your phone isn’t happy and able to work reliably with the sensors, and you aren’t keen on upgrading it - would getting a Libre reader be a good option? That way you’d have a fallback way of scanning sensors as and when you do upgrade your phone in the future. You can buy one for about £50 I think?
I have been using a Google Pixel for the last 2 years. The only problem I have noticed is when I have more than 3 items connected by Bluetooth.I had problems with Bluetooth and Wifi on a new Samsung A53 (both wouldn't work together). Returned the phone a bought a Google Pixel.